As of a couple years ago, i had been a freshwater keeper 20+ years, decided to kick off a salt tank on a minimum budget, minimum tech fowlr setup. My tanks all run relatively large sumps with just filter socks handling the filtration, lots of water volume and flow through sump, little to no gadgets or dosing involved, no skimmer or auto top off. Had a good thing going until stocking issues among other things got the better of me. At a minimum I would definitely recommend a sump with a surface skimming overflow in the display tank. The bigger the sump tank the better, ie the more water volume to control, the better. If i had it to do over again, i would do a couple things different:
-skimmer is a must: once my fish put on some size, i found myself struggling to keep up with water parameters. I would have to perform large water changes every week (30-50%), which ate up a lot of $$$ in salt, and the large changes caused instability in my water chemistry...it appeared that my fish were doing fine, but there was a definite impact to the ecosystem...algae blooms, temperature swings, salt creep, ph crashes. I believe a quality skimmer wouldve given me an edge , minimized the waste buildup in the water column...once my cleanup crew was eviscerated by my growing predatory fish there was a lot of decaying matter in the tank i couldnt control.
-RODI: this goes hand in hand with the skimmer. The nutrient rich, mineral rich tap water i was mixing only exacerbated the above problems, even when properly conditioned and mixed. Ime, with salt, the more control, more stability in the water you have the better.
Im rebooting my tanks now with freshwater...if i ever go back to salt I'll be including a lot more of the above. Best thing i can say is be prepared to spend more time, more effort, more money if you want to be successful with salt vs fresh.
[/Westport.
I've had a similar experience and spent so much money. I definitely agree with everything you stated. Thinking about doing a Nano but will see ?